Leak-regulator for primary pneumatics.



Ml CLARK.

LBAK REGULATOR 11011 PRIMARY PNBUMATIGS.

Patented Mar.14,1911.

APPLICATION FILED 1380.6, 1'909.

152 U12/R50? ZUZ'Z g .1

sheet.

I It consists Aof .the features of construction "nher, called this aperture, or leak-port being so MELVILLECLARK, OF CHICAGO, I LLIOIS.

LEAK-REGULATOR FSR PRIMARY PNEHQTICB.

Spccilcatioii of Letters rat-ent.

Application filed December 6, 190g. Serial No. 581,477.'

To 'all .whom it may concern: l

Be it known that I, MELvinLE CLARK, 4a citizen of the United States, residing at Chicalo, in .thecounty of Cook' and State of 6 Amois, ,have invented new and usefulv Inil nements in Leak-Regulatorsfor Primary f-Ehhumatics, `of which the following is a specifica-tion, reference being had to the accoming drawings, forming a part thereof. '1" e purpose of this invention is to provi'de an im ,roved device for controlli-ng what vis called tlie leak of the rimary pneumatic in an auto-pneumatic mechanism, which is governed by a perforated' controller shown Aand described as indicated in the In .the dwalingen-Figure 1 .is a front '20'e1eiiltijonoi a portion of the primary pneu-' be matic chamber of-a pneumatic actionof the character to which this invention is ada tred, having primary the 'features constituting this invention.

. primary pneuy matics tothe duct bar, on which ed on a' scale. Fig. 3. is a similar-view at the linev 3-3 ofFig. 1. Fig. 4-is a section'of the line 4-.4 on Fig. 1. Fig. -5 is a detail section at 'the line 5-5 on F ig.4x.

This invention isparticularly desi nedto be 'applied't'o pneumatic pneumatic musical4 instruments, which'are controlled' by aperforatednote sheet, l'iutl it is applicable to any -auto-pneumatic mechanism which is similarly' controlled. It is well understood that in the'operation of this form of automatic mechanism primary pneu- Al-'matics corresponding to theseveral. motor pneumatics to be brought intol action by the registrationofthe perforations on the controller sheet, with ducts ofv a' tracker, are

' p mounted within a chamber from which the '45 air' is partially exhausted by the devices provided for that 'pur ose, each primary neuy "matic beingnorma y in collapsed con ition and having its interiorcavitynin communicaftion' with the Vprimary pneumatic chamber,-

'so thaiis'thefeiwmber'within wich-r11,l the pri-ir i; 'mary pneuni'atics are ;assembled,`through whatv is known Vas affleak-portp, which .is 'n primary vpneumatic lchamthrough the leak-port, Lsi'ich e pneumatics provi edv actions o automuch smaller the duct by which the primary pneumatic communicates through the tracker with vtheiout'er air valien-v the registration of. 'the m r aperture'on the controller sheet. wit ft tracker duct that the pneumatic will beinmouth occurs, y Hated by atmospheric v'air entering throng-h' such duct, notwithstand'A vtheleakage .lz-port, however, the tracker duct isclosed to cause the pri- Patented vMar. 14, v1911., l

eing suilic'ient when the-inlet through mary pneumatic togpromptly resumev its colj lapsed condition by the 'eqliz' 'of the' tension of air Within it with'f'thatllli the'primary pneumaticchamberfin which v'it 'is situated. j-`

' In order thatthe uonofct-'ne ri pneumatic may and collapse, the size; of the leak-port must very carefully regulated. A 4common the fact that this vsmall leak-port is liable to become (bstructed with specks of dust, or most fr quently by, -Small fragments of pipr from'the controller sheet, consisting o t e some o which sometimes-adhere tothe man gins of the perforations and become. pulled off in the usev ofxt'he sheet and is'uckedj through the tracker duct vinto the-primary pneumatics and'becoine Alodged-*over 'the leak-port, operating asv minute valves, closing said ports, being 'held in said position by the suction. For the 'pur i coming `this diiculty, I make the leak-'port as an'laxial aperture, 1, in a screw, 2,/which lis 'screwed throu Athe wall either of the primary pneumatic or of the duct leading Ato 1t. -Tlieend of the screw protrudes well into the duct or terminate o' from the wall through which it' cxtends,the end -prutiuding`be1ng ref..- era -ly ta ered as seen at 3, sothatanyii'agments o paper which might constitute a valve or stopper, lodging on`the end,'will not be retained, but wlll tend to slide along the inclined or tapered end to esca e from obstructive position. The axial, does not extend throiigh the entire'length of the screw, butlis connected by a lateral or radial branch, 4, which leads out through the sideof the-screw. The .diameter of thisl lateral mouth, Sonata-least its 'dimension longitudinal] of the screw, is such Aas to adapt it to aiiiord a maximum leak-port, and preferablyco'nsiderably more than any ordiprompt, 'both 'in Inflation of over-f 'lol diiculty in such'constructions `arises from sfounchings made in thel perform-ions,

95 pneumatic cavity so as? to.

ico

uct, 1,

l ferently with different nary leak opening which would be required, and 'the amount of avallable opening is regulated by screwing the screw more or less into 4 the wall through which it is set, leaving only so much of the diameter of the lateral;

mouth, 4, of the leak duct exposed beyond the outer surface of such wall as will afford the necessary leakage. The proper amount `of such opening. will vary with a variety of conditions, principal ot' which is the density or closenessof the leather, 5, which' forms the bellows Wall of the primary pneumatic;

tion of the inst-ruinent changes by use, re-

adjustment of. the leak-port may be made in the same manner from time to time, or difneumatics 4in the same instrument, thelea't er of some oft-he neumatics becoming in time thoroughly fpilled up with an accumulation of line dust that is constantly drawn into the-pneumatics in service, while the texture of the leather l of the pneumatics may become moreA porous 4from varying atmospheric conditions; but

whatever the cause of porousness or the amount of variation, the correction can readily be made by means of the leak-port screw, 2, turning 1n or out as the caserequires. Y

In 4order that the adjustment of the leakport screws may be made without necessipose a suitable point in the several primary pneumatics or their duct bars, for receiving the leak-port screws, 2; and such opening 7n l I I being provided with a movable cover p ate,

8, the removal of the saine gives ready access to all the leak-port screws, as seen in Fig. I.

I claim zl. In combination with a primary pneumatic a screw screwed directly through a side-wall of the pneumatic, having an axial aperture leading from its inner end outwardly past the plane of the enter surface side-wail, and a transverse port from said axial aperture, positioned so as to he cut by said plane, whereby the portion of its area exposed outside said wall may be varied by the adjustment of the screw in the wall.

2. In combination with a primar pneu- 1natic,'a screw set through a slde-Wa 1 thereof and protruding'into thecavity of the pneumatic, such screw having its inner 'nd conically tapered, and having an axiala erture leading from the apex of the conlcal end outward with respect to the pneumatic past the plane of t-hev outer surfaceof sai Wall, and opening outside said wall to afford a. leak-port. i

In testimony whereof I have here'imtoset my hand, in the presence of two witnesses,

at Chicago, Illinois, this second day of December 1909.V

`MELVILLE CLARK. y In the presence of- CHAS. S. BURTON, M. GERTRUDE ADY 

